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Sure -but all i can say is it works.I am in a pathetic wind area -houses and only 3m high (planning /nasty neighbours) .I only erected it to prove a point and yes it does work .Here it produces virtually nothing and only a smidgen when its windy.BUT in the right location it would happily export what ever a Rutland 504 produces to the grid.A Rutland 913 would be better .Will leave up cos wind turbines please me , will move it when we move -hopefully a more rural and windy location ..........Did i mention I have an Ampair vertical turbine in my shed ......... may be another chapter.George